Olivia Newton-John, English-Australian singer-songwriter and actress
Dame Olivia Newton-John (born 26 September 1948) is a British-born Australian singer, songwriter, actress, entrepreneur and activist. She is a four-time Grammy Award winner whose music career includes five US number-one hits and another ten top-ten hits on the Billboard Hot 100, and two Billboard 200 number-one albums, If You Love Me, Let Me Know (1974) and Have You Never Been Mellow (1975). Eleven of her singles (including two Platinum) and 14 of her albums (including two Platinum and four 2× Platinum) have been certified Gold by the Recording Industry Association of America (RIAA). With global sales of over 100 million records, Newton-John is one of the best-selling music artists from the second half of the 20th century to the present.In 1978, she starred in the musical film Grease, whose soundtrack remains one of the world's best-selling albums of recorded music. It features two major hit duets with co-star John Travolta: "You're the One That I Want" – which ranks as one of the best-selling singles of all time – and "Summer Nights". Her signature solo recordings include the Record of the Year Grammy winner "I Honestly Love You" (1974) and "Physical" (1981) – Billboard's Top Hot 100 Single of the 1980s – plus her cover of "If Not for You" (1971), "Let Me Be There" (1973), "If You Love Me (Let Me Know)" (1974), "Have You Never Been Mellow" (1975), "Sam" (1977), "Hopelessly Devoted to You" (also from Grease), "A Little More Love" (1978), from the 1980 film Xanadu, "Magic" and "Xanadu" (with Electric Light Orchestra), "Heart Attack" (1982), and from the 1983 film Two of a Kind, "Twist of Fate".

Newton-John has been a longtime activist for environmental and animal rights issues. She has been an advocate for health awareness, becoming involved with various charities, health products and fundraising efforts. Her business interests have included launching several product lines for Koala Blue and co-owning the Gaia Retreat & Spa in her home country Australia.